I found this on wiki:
Cluster beacons

A group of radio beacons with single-letter identifiers ("C", "D", "M", "S", 
"P", "A", "M" and "K") have been regularly reported in
small spectrum segments centered around 3594, 4558, 5154, 7039, 8495, 10872, 
13528, 16332 and 20048 kHz. The term "cluster beacons"
is frequently used for them, as these beacons transmit in parallel on 
frequencies only 0.1 kHz apart. These beacons transmit only
their single-letter identifier in standard CW (A1A) using morse code.

The following callsigns and frequencies of cluster beacons have been reported 
recently in Numbers&Oddities newsletter, Utility DX
Forum and ENIGMA-2000:
ID letter       Channel         Frequencies (kHz)
L (21)  -0.8    7038.2, 7041.8(23), 8494.2, 8497.9
D       -0.3    3593.7, 4557.7, 5153.7, 7038.7, 8493.7, 10871.7, 13527.7, 
16331.7, 20047.7
P       -0.2    3593.8, 4557.8, 5153.8, 7038.8, 8494.8, 10871.8, 10872.8 (21), 
13527.8,
16331.8, 20047.8
S       -0.1    3593.9, 4557.9, 5153.9, 7038.9, 8494.9, 10871.9, 13527.9, 
16331.9, 20047.9
C       0.0     3594.0, 4558.0, 5154.0, 7039.0, 8495.0, 10872.0, 13528.0, 
16332.0, 20048.0
A       +0.1    3594.1, 4558.1, 5154.1, 7039.1, 8495.1, 10872.1 13528.1 16332.1 
(10)
F       +0.2    7039.2, 8495.2, 10872.2, 13528.2, 16332.2
K       +0.3    4558.3, 5154.3, 7039.3, 8495.3, 10872.3, 16332.3
M       +0.4    5154.4, 7039.4, 8495.4, 10872.4, 13528.4, 16332.4

Occasionally some cluster beacons (especially "F" and "M") have been reported 
transmitting on frequencies different from their
regular channel for short periods.

73,
Tim Herrick, KQ8M
Charter Member North Coast Contesters
[email protected]

AR-Cluster V6 kq8m.no-ip.org
User Ports: 23, 7373  with local skimmer, 7374 without local skimmer
Server Ports: V6 3607, V4 Active 3605, V4 Passive 3606


-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of David G4DMP
Sent: Wednesday, April 03, 2013 1:56 PM
To: Dave KK7SS
Cc: elecraft_mailman. qth. net
Subject: Re: [Elecraft] Repetitive"K" on 7.039.3 question

In a recent message, Dave KK7SS <[email protected]> writes
>For at least the last 5 hours, there has been a station sending the
>letter "K" on 7,039.3 CW once every second non-stop.
>Can anyone tell me what it is for??

Direction Finding of fishing buoys:

C - Moscow, European Russia      37.58E  55.75N
D - Odessa, Ukraine              30.70E  46.48N
F - Vladivostok, Asiatic Russia 131.85E  43.14N
K - Khabarovsk, Asiatic Russia  135.10E  48.50N
L - St Petersburg, Eur. Russia   30.33E  59.92N
M - Magadan, Asiatic Russia     150.83E  59.63N
O - Moscow, European Russia      37.58E  55.75N
P - Kaliningrad, Eur. Russia     20.50E  54.72N
R - Ustinov,
S - Archangel, European Russia   41.00E  64.66N
U - Murmansk, European Russia    33.08E  68.97N
V - Tashkent,
X - Prague, Czech Republic       14.43E  50.08N
yu - Kholmsk, Asiatic Russia    142.08E  47.66N
     (yu is di-di-dah-dah)

-- 
 + - - - - - - - - - - - - - - - - +
 | David M Pratt, Kippax, Leeds.   |
 | Website: http://www.g4dmp.co.uk |
 + - - - - - - - - - - - - - - - - +

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